Arc Flash and DC Systems
Arc Flash and DC Systems
(OP)
thread238-218868: Arc Flash-flooded type U.P.S. Battery strings
I was reading through thread238-218868: Arc Flash-flooded type U.P.S. Battery strings that discussed Arc Flash and Battery Strings.
Some statements seemed to be made that there are no recognized standards for DC arc flash. I think what was meant was arc flash calculations but want to be sure.
In NFPA 70e (2009), Section 320 (intro), Batteries and Battery Rooms, it says, "Working with batteries exposes a worker to both shock and arc flash." But, I can't see that any of the rest of 320 discusses arc flash. Section 310.5(C) for Electrolytic Cells interestingly excludes Section 130.3.
But for either case, wouldn't section 130.7, specifically Table 130.7(C)(9), still be in effect, ie the Table approach to required PPE? Neither the voltages in the table or the kA short circuit current in Notes 1-4 are specifically called out as "VAC" or "kAAC"
I also see no AC limitations to any of the scoping parts of the standard such as Section 90.2, Scope.
Would it then be correct to say that NFPA 70e (and OSHA 29 CFR Part 1910) do cover DC but it is simply IEEE1584 that does not?
Thanks so much for any help.
I was reading through thread238-218868: Arc Flash-flooded type U.P.S. Battery strings that discussed Arc Flash and Battery Strings.
Some statements seemed to be made that there are no recognized standards for DC arc flash. I think what was meant was arc flash calculations but want to be sure.
In NFPA 70e (2009), Section 320 (intro), Batteries and Battery Rooms, it says, "Working with batteries exposes a worker to both shock and arc flash." But, I can't see that any of the rest of 320 discusses arc flash. Section 310.5(C) for Electrolytic Cells interestingly excludes Section 130.3.
But for either case, wouldn't section 130.7, specifically Table 130.7(C)(9), still be in effect, ie the Table approach to required PPE? Neither the voltages in the table or the kA short circuit current in Notes 1-4 are specifically called out as "VAC" or "kAAC"
I also see no AC limitations to any of the scoping parts of the standard such as Section 90.2, Scope.
Would it then be correct to say that NFPA 70e (and OSHA 29 CFR Part 1910) do cover DC but it is simply IEEE1584 that does not?
Thanks so much for any help.






RE: Arc Flash and DC Systems
The PPE insulating requirements may come closer to being valid, but still have not been tested for DC.
Alan
"The engineer's first problem in any design situation is to discover what the problem really is." Unk.
RE: Arc Flash and DC Systems
Alan
RE: Arc Flash and DC Systems
Alan
"The engineer's first problem in any design situation is to discover what the problem really is." Unk.
RE: Arc Flash and DC Systems
Alan
"The engineer's first problem in any design situation is to discover what the problem really is." Unk.
RE: Arc Flash and DC Systems
Good references in this thread, the host of this is part of the IEEE team doing the research. http://www.arcflashforum.com/showthread.php?t=448
RE: Arc Flash and DC Systems
I have attached the exact site below.
Hugh Hoagland
http://www.e-hazard.com
http://www.arcwear.com